/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.fn.harness.data;



import com.bff.gaia.unified.sdk.fn.data.FnDataReceiver;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.Iterables;



import java.util.Collection;



/**

 * A {@link FnDataReceiver} which forwards all received inputs to a collection of {@link

 * FnDataReceiver receivers}.

 */

public class MultiplexingFnDataReceiver<T> implements FnDataReceiver<T> {

  public static <T> FnDataReceiver<T> forConsumers(Collection<FnDataReceiver<T>> consumers) {

    if (consumers.size() == 1) {

      return Iterables.getOnlyElement(consumers);

    }

    return new MultiplexingFnDataReceiver<>(consumers);

  }



  private final Collection<FnDataReceiver<T>> consumers;



  private MultiplexingFnDataReceiver(Collection<FnDataReceiver<T>> consumers) {

    this.consumers = consumers;

  }



  @Override

  public void accept(T input) throws Exception {

    for (FnDataReceiver<T> consumer : consumers) {

      consumer.accept(input);

    }

  }

}